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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238db17a1617f6699c13d6a26b7a41c02602d9244e932f9cdd9b4e56910ab968' 
  AND token = 'mgmcovcR9UiHEXIb7xgxZ4dbG29M+ZG6PPYOytzkCoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}